|Real name||Harleen Qunizel|
|First appearance||"The Joker #15"|
Harleen Quinzel was the Joker's apprentice until his death. She is now the lover of Poison Ivy.
Dr. Harleen Quinzel attempted to become instantly famous by publishing a novel about the Joker. he kidnapped her and escaped. She suffered from Stockholm Syndrome and fell in love with him. He took advantage of her and she became his sidekick.
Working with Poison Ivy
After she left the Joker, she teamed up with fellow villain, Poison Ivy. They worked together on several occasions and they became best friends.
Return to the Joker
Harley left when Ivy was arrested. She returned to the Joker, but he no longer cared for her at all. She remained, but when he clashed with Deadpool and died, Harley escaped and returned to Ivy.
She returned and she and Ivy confessed their feelings for each other. They decided to leave their life of crime behind. But even they know that won't last forever.